Small fix in fmpz_poly/profile/p-mul_triangle.
Small fix in fmpz_poly/profile/p-mul_triangle.

wbhart/flint2,fredrik-johansson/flint2,fredrik-johansson/flint2,jpflori/flint2,jpflori/flint2,fredrik-johansson/flint2,dsroche/flint2,wbhart/flint2,wbhart/flint2,dsroche/flint2,dsroche/flint2,jpflori/flint2,jpflori/flint2,dsroche/flint2